Pemberian Pupuk Npk Dan Kompos Sludge Pabrik Kelapa Sawit Dengan Aktivator Em…

ABSTRACT The research aimed to increase the production of maize on marginal soil which have low soil fertility. The addition of NPK fertilizer and palm oil mill sludge compost with EM4 activator is an alternative way to improve the fecundity of marginal soil. The research was carried out in the experimental garden of the Faculty of Agriculture, Riau University from March to June 2021. The fiel…